SBML API: enable/disable a warning on Windows [ci skip].
SBML API: enable/disable a warning on Windows [ci skip].

This is required to get things to work using Qt 5.5 (although we don’t
yet want to use that version of Qt since it’s causing us problems on OS
X).

mirams/opencor,mirams/opencor,mirams/opencor,mirams/opencor,mirams/opencor